What are the most popular programming languages? The only honest answer: It depends. Are you trying to land a job at a hot mobile app startup, model electricity flows across a continent, or create an electronic art project? Languages are tools, and what’s a “must have” in one domain can be a “whatever” in another. So for the second year in a row, IEEE Spectrum has teamed up with computational journalist Nick Diakopoulos to give you a popularity...